$OpenBSD: patch-Bustle_Stats_hs,v 1.1 2012/09/02 22:12:36 kili Exp $
--- Bustle/Stats.hs.orig	Fri Oct 29 01:06:58 2010
+++ Bustle/Stats.hs	Fri Jul 13 21:50:24 2012
@@ -36,7 +36,7 @@ frequencies = reverse
     where alt Nothing  = Just 1
           alt (Just n) = Just (n + 1)
 
-mean :: Fractional a => [a] -> a
+mean :: (Eq a, Fractional a) => [a] -> a
 mean = acc 0 0
    where acc 0 _ [] = error "mean of empty list"
          acc n t [] = t / n
